Python 2 o Python 3

Una de las cosas que menos me gusta de Python es la diferencia entre versiones. Se han introducido modificaciones importantes en sintaxis y módulos clave que hacen que código escrito para Python 3.x no funcione en la 2.x (para más detalle ver este post de Guido van Rossum, creador del lenguaje). Por tanto, una de las primeras tareas antes de empezar a desarrollar es decidir qué versión se va a usar. Y aquí la clave no está en qué características del lenguaje vamos a utilizar, sino qué librerías y frameworks vamos a necesitar.

Por ejemplo, resulta dramático que los bindings de mysql no estén soportados en python3. Existe un módulo para utilizar estas bases de datos en Python 3 (ver PyMySQL) pero si has venido utilizando el módulo de toda la vida, el  MySQL-python, tendrás que quedarte en la 2.7.

Puedes ver de un vistazo qué módulos, de los más populares, están portados a Python 3 en Python 3 Wall of Superpowers.

Ojo, que Python3 salió el 3 de diciembre de 2008. No es algo que pasase ayer o hace unos meses. Han pasado varios años y aunque hay avances, sigue habiendo carencias importantes. Como norma general, y a día de hoy, la rama 2.7.x dará menos problemas. Existen herramientas como 2to3 y un montón de documentación sobre cómo migrar de python 2 a python 3, pero no cómo hacerlo de la 3 a la 2 si llegaras a necesitarlo.

Con esta foto, y pese a lo que se indica en la web de python:

Python 2.x is the status quo, Python 3.x is the present and future of the language

yo me quedaría en la versión 2.7. Te ahorrarás dolores de cabeza.

6 pensamientos en “Python 2 o Python 3

  1. No veo donde está el problema … si el lenguaje no evolucionara sería una lengua muerta y por tanto un fracaso.

    Que haya diferencias de sintaxis es normal en los lenguajes que están evolucionando. De todas formas yo te recomendaría usar 2.7 a menos que sepas 100% seguro que todas las librerías que vas a usar están ya en 3.x

  2. Hombre, el problema está en que las librerías evolucionan a un ritmo muy distinto al del lenguaje, lo que provoca que no se adopten las características nuevas del lenguaje.

    Es la pescadilla que se muerde la cola.

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